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排序方式: 共有311条查询结果,搜索用时 46 毫秒
1.
Phase Behavior of a Designed Cyclopropyl Analogue of Monoolein: Implications for Low‐Temperature Membrane Protein Crystallization 下载免费PDF全文
Livia Salvati Manni Dr. Alexandru Zabara Dr. Yazmin M. Osornio Jendrik Schöppe Dr. Alexander Batyuk Prof. Dr. Andreas Plückthun Prof. Dr. Jay S. Siegel Prof. Dr. Raffaele Mezzenga Prof. Dr. Ehud M. Landau 《Angewandte Chemie (International ed. in English)》2015,54(3):1027-1031
Lipidic cubic phases (LCPs) are used in areas ranging from membrane biology to biodevices. Because some membrane proteins are notoriously unstable at room temperature, and available LCPs undergo transformation to lamellar phases at low temperatures, development of stable low‐temperature LCPs for biophysical studies of membrane proteins is called for. Monodihydrosterculin (MDS) is a designer lipid based on monoolein (MO) with a configurationally restricted cyclopropyl ring replacing the olefin. Small‐angle X‐ray scattering (SAXS) analyses revealed a phase diagram for MDS lacking the high‐temperature, highly curved reverse hexagonal phase typical for MO, and extending the cubic phase boundary to lower temperature, thereby establishing the relationship between lipid molecular structure and mesophase behavior. The use of MDS as a new material for LCP‐based membrane protein crystallization at low temperature was demonstrated by crystallizing bacteriorhodopsin at 20 °C as well as 4 °C. 相似文献
2.
A simple model is presented which can be used to predict the modifying effect of a dispersed-phase on the turbulence structure of two-phase jets. It is based on Kolmogorov's concept of spectral energy transfer and takes into account the additional energy dissipation resulting from the inability of dispersed-phase particles to completely follow turbulent eddy fluctuations. According to the analysis presented, high-frequency eddies are attenuated preferentially and a reduction of the total rate of turbulent energy dissipation results. Turbulence intensities were also reduced. Good agreement between predictions and experimental findings were obtained. 相似文献
3.
Neyva M. L. Romeiro Rigoberto G. S. Castro Sandra M. C. Malta Luiz Landau 《Transport in Porous Media》2007,70(1):1-10
We study a one-dimensional multi-species system of dispersive-advective contaminant transport equations coupled by nonlinear
biological (kinetic reactions) and physical (adsorption) processes. To deal with the nonlinearities and the coupling, and
to avoid additional computational costs, we propose a linearization technique based on first-order Taylor’s series expansions.
A stabilized finite element in space, combined with an Euler implicit finite difference discretization in time, is used to
approximate the dispersive-advective transport problem. Three computational tests are performed with different boundary conditions,
retardation factors and kinetic parameters for a nonlinear reactive multi-species transport model. The proposed methodology
is shown to be accurate and decrease computational costs in the numerical implementation of nonlinear reactive transport problems. 相似文献
4.
Itamar Landau 《Journal of Combinatorial Theory, Series A》2009,116(2):421-433
The rotor-router model is a deterministic analogue of random walk. It can be used to define a deterministic growth model analogous to internal DLA. We show that the set of occupied sites for this model on an infinite regular tree is a perfect ball whenever it can be, provided the initial rotor configuration is acyclic (that is, no two neighboring vertices have rotors pointing to one another). This is proved by defining the rotor-router group of a graph, which we show is isomorphic to the sandpile group. We also address the question of recurrence and transience: We give two rotor configurations on the infinite ternary tree, one for which chips exactly alternate escaping to infinity with returning to the origin, and one for which every chip returns to the origin. Further, we characterize the possible “escape sequences” for the ternary tree, that is, binary words a1…an for which there exists a rotor configuration so that the kth chip escapes to infinity if and only if ak=1. 相似文献
5.
Spectroscopic characterization of bacteriorhodopsin's L-intermediate in 3D crystals cooled to 170 K.
A Royant K Edman T Ursby E Pebay-Peyroula E M Landau R Neutze 《Photochemistry and photobiology》2001,74(6):794-804
Spectra are presented from a single 3D microcrystal of bacteriorhodopsin (bR) cooled to 170 K under various illumination conditions. This set is necessary and sufficient to assign the relevant crystal reference spectra. A spectral decomposition of the difference spectrum obtained following the trapping protocol of Royant et al. (2000) (Nature 406, 645-648) is given, confirming that the low temperature L-intermediate was the species that dominated the structural rearrangements previously reported. Smaller contributions from the K and M spectral intermediates are also quantified. Mechanistic insights derived from the X-ray structures of the early bR intermediates are discussed. 相似文献
6.
H. Landau 《Fresenius' Journal of Analytical Chemistry》1894,33(1):617-618
Ohne Zusammenfassung 相似文献
7.
8.
Edmund Landau 《Mathematische Zeitschrift》1930,32(1):699-702
Ohne Zusammenfassung 相似文献
9.
L. Landau 《Zeitschrift für Physik A Hadrons and Nuclei》1930,64(9-10):629-637
10.
Edmund Landau 《Mathematische Zeitschrift》1919,5(3-4):319-320
Ohne Zusammenfassung 相似文献